Generalised Lymphadenopathy Causes
- Crack Medicine
- 2 days ago
- 4 min read
TL;DR
List: Causes of Lymphadenopathy (Generalized) is a frequently tested topic in MRCP Part 1 because it integrates infectious diseases, haematology, rheumatology, oncology and immunology. A systematic approach based on infections, malignancy, autoimmune disease, drugs and miscellaneous conditions allows candidates to narrow the differential rapidly. This guide summarises the highest-yield causes, common examination traps, an exam-style MCQ and practical revision checklist.
Why this matters
Generalised lymphadenopathy appears across multiple specialties:
Infectious Diseases
Haematology
Rheumatology
Oncology
HIV Medicine
Clinical Immunology
Questions often combine:
Fever
Weight loss
Night sweats
Rash
Hepatosplenomegaly
Abnormal blood counts
Autoimmune markers
Drug history
Developing a structured differential greatly improves diagnostic accuracy during the examination.
Core sections
A systematic approach
A useful framework is:
Infections
Malignancy
Autoimmune disease
Drugs
Storage and infiltrative disorders
Miscellaneous rare causes
The 10 highest-yield causes of generalised lymphadenopathy
Category | High-yield causes | Typical examination clues |
Viral infections | Infectious mononucleosis (EBV), CMV, HIV | Fever, sore throat, hepatosplenomegaly |
Bacterial infections | Tuberculosis, secondary syphilis | Constitutional symptoms, chronic illness |
Haematological malignancy | Hodgkin lymphoma, Non-Hodgkin lymphoma, CLL | B symptoms, painless nodes |
Acute leukaemia | ALL, AML | Cytopenias, blasts, bruising |
Autoimmune disease | SLE, rheumatoid arthritis, Sjögren syndrome | Rash, arthritis, positive autoantibodies |
Granulomatous disease | Sarcoidosis | Bilateral hilar lymphadenopathy |
Drug reactions | Phenytoin, allopurinol, carbamazepine, DRESS | Rash, eosinophilia |
HIV-related disorders | Acute HIV, advanced HIV | Opportunistic infections |
Storage diseases | Gaucher disease | Massive splenomegaly |
Miscellaneous | Castleman disease, Kikuchi disease | Rare but examinable |
The five most tested subtopics
1. Infectious causes
These remain the commonest examination scenarios.
Epstein-Barr virus (EBV)
Classic features include:
Fever
Sore throat
Posterior cervical lymphadenopathy
Splenomegaly
Atypical lymphocytes
Positive heterophile antibody test
MRCP favourite:
Never prescribe amoxicillin in infectious mononucleosis, as a widespread rash commonly develops.
Cytomegalovirus
Very similar to EBV but:
Heterophile test usually negative
Milder pharyngitis
Mononucleosis-like illness
HIV infection
Generalised lymphadenopathy may be seen:
During acute seroconversion
During chronic HIV infection
Associated findings include:
Oral candidiasis
Weight loss
Persistent fever
Opportunistic infections
Tuberculosis
Typically presents with:
Persistent constitutional symptoms
Matted lymph nodes
Pulmonary or extrapulmonary disease
Remember that disseminated tuberculosis may produce widespread lymphadenopathy.
2. Haematological malignancies
Extremely common in MRCP Part 1.
Hodgkin lymphoma
Key features:
Painless lymphadenopathy
Night sweats
Fever
Weight loss
Alcohol-induced node pain (rare but highly examinable)
Non-Hodgkin lymphoma
Often presents with:
Widespread nodal disease
Extranodal involvement
Bone marrow infiltration
Chronic lymphocytic leukaemia (CLL)
Typical clues include:
Older patient
Persistent lymphocytosis
Generalised lymphadenopathy
Smudge cells
Splenomegaly
3. Autoimmune diseases
Systemic lupus erythematosus (SLE)
Patients may have:
Fever
Generalised lymphadenopathy
Arthritis
Photosensitive rash
Positive ANA
Low complement
Rheumatoid arthritis
Generalised lymphadenopathy is uncommon but may occur in:
Active disease
Felty syndrome
Sjögren syndrome
Often associated with:
Dry eyes
Dry mouth
Salivary gland enlargement
Increased lymphoma risk
4. Drug-induced lymphadenopathy
Frequently forgotten during revision.
Important drugs include:
Phenytoin
Carbamazepine
Lamotrigine
Allopurinol
Sulphonamides
Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS) often causes:
Fever
Rash
Eosinophilia
Hepatitis
Generalised lymphadenopathy
This is an important cross-link topic with Drug Rashes: SJS vs TEN vs DRESS.
5. Granulomatous and miscellaneous diseases
Sarcoidosis
Typical findings include:
Bilateral hilar lymphadenopathy
Erythema nodosum
Uveitis
Raised serum ACE (non-specific)
Castleman disease
Rare but occasionally examined.
Features include:
Generalised lymphadenopathy
Fever
Raised inflammatory markers
IL-6 overproduction
Practical study framework
Instead of memorising individual diseases, classify them into:
Infectious
EBV
CMV
HIV
Tuberculosis
Syphilis
Toxoplasmosis
Malignant
Hodgkin lymphoma
Non-Hodgkin lymphoma
CLL
Acute leukaemia
Autoimmune
SLE
Rheumatoid arthritis
Sjögren syndrome
Drugs
Phenytoin
Carbamazepine
Allopurinol
Lamotrigine
Miscellaneous
Sarcoidosis
Castleman disease
Gaucher disease
This framework is considerably easier to recall under examination pressure.
Practical examples / mini-cases
Mini Case
A 24-year-old man presents with:
Fever
Sore throat
Posterior cervical lymphadenopathy
Splenomegaly
Blood tests show atypical lymphocytes.
What is the most likely diagnosis?
A. Acute HIV infection
B. Cytomegalovirus infection
C. Infectious mononucleosis
D. Hodgkin lymphoma
E. Secondary syphilis
Answer
Correct answer: C. Infectious mononucleosis
Explanation
Posterior cervical lymphadenopathy together with fever, pharyngitis, splenomegaly and atypical lymphocytes is the classic presentation of Epstein-Barr virus infection.
Practical study-tip checklist
✓ Separate causes into infection, malignancy, autoimmune disease and drugs.
✓ Always look for constitutional ("B") symptoms.
✓ Remember posterior cervical nodes strongly suggest EBV.
✓ Learn the common drug causes of DRESS syndrome.
✓ Associate persistent lymphocytosis with CLL.
✓ Recognise sarcoidosis by bilateral hilar lymphadenopathy.
✓ Distinguish HIV seroconversion from infectious mononucleosis.
✓ Revise associated blood film findings.
Common pitfalls
Confusing localised and generalised lymphadenopathy.
Forgetting drug-induced causes, particularly anticonvulsants and allopurinol.
Assuming every patient with fever and lymphadenopathy has lymphoma.
Missing HIV as a cause in younger adults with persistent generalised nodes.
Overinterpreting isolated raised serum ACE as diagnostic of sarcoidosis.
FAQs
What is considered generalised lymphadenopathy?
Generalised lymphadenopathy involves enlargement of lymph nodes in two or more non-contiguous regions, suggesting an underlying systemic disorder rather than a local process.
Which infection is most commonly tested in MRCP Part 1?
Epstein-Barr virus infectious mononucleosis is among the highest-yield infections because of its characteristic triad of fever, pharyngitis and posterior cervical lymphadenopathy.
Which malignancies commonly cause generalised lymphadenopathy?
Hodgkin lymphoma, non-Hodgkin lymphoma, chronic lymphocytic leukaemia and acute leukaemias are the principal malignant causes tested in MRCP Part 1.
Which drugs should I remember?
Phenytoin, carbamazepine, lamotrigine and allopurinol are particularly important because they may cause DRESS syndrome with fever, rash and widespread lymphadenopathy.
What is the best revision strategy?
Group diseases into infections, malignancies, autoimmune disorders, drug reactions and miscellaneous causes. Pattern recognition is more effective than memorising long disease lists.
Ready to start?
Continue your revision by exploring the MRCP Part 1 Overview:
Practise exam-style questions in the Free MRCP QBank:
Assess your readiness with MRCP Mock Tests:
For structured teaching, visit the MRCP Lectures:
Sources
MRCP(UK). https://www.mrcpuk.org/
National Institute for Health and Care Excellence (NICE). https://www.nice.org.uk/
British Society for Haematology. https://b-s-h.org.uk/
European AIDS Clinical Society Guidelines. https://www.eacsociety.org/
Oxford Handbook of Clinical Medicine.
Kumar & Clark's Clinical Medicine.
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